Mark FORBIDDEN and DEPRECATED after discussion with the maintainer (ume)
due to remotely exploitable vulnerabilities.
http://vuxml.freebsd.org/114d70f3-3d16-11d9-8818-008088034841.html
http://vuxml.freebsd.org/c0a269d5-3d16-11d9-8818-008088034841.html

Use ${ECHO_CMD} instead of ${ECHO} where you mean the echo command; the ECHO
macro is set to "echo" by default, but it is set to "true" if make(1) is
invoked with the -s option while ECHO_CMD is always set to the echo command.

- Install more html docs. - IPv6 patch was updated to 20010709 version.
(Now, reconfig by SIGHUP should work. However, since master is running
without root privilege, re-bind to privileged port still fails. I believe
it is original problem.)